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Dissertations / Theses on the topic 'Alien and indigenous vegetation'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Yekwayo, Inam. "Response of invertebrates to alien and indigenous vegetation characteristics in Nduli and Luchaba Nature Reserves, Eastern Cape, South Africa." Thesis, Walter Sisulu University, 2012. http://hdl.handle.net/11260/d1009478.

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Most invertebrate species are becoming extinct due to habitat loss and alien plant invasions. Hence this study aimed at determining the response of invertebrates to alien and indigenous vegetation within protected areas in the King Sabatha Dalindyebo (KSD) Local Municipality, Eastern Cape, South Africa. Invertebrates were collected using pitfall traps, during 12 sampling occasions from May 2010 to April 2011 numbers of sampling sites. Although the sampling method was adapted to collecting ground dwelling invertebrates, opportunistic flying invertebrates were also collected. A total of 7 flying

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2

Tessendorf, Sharon Erica. "Estimating the willingness-to-pay for restoring indigenous vegetation at selected sites in South Africa." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/617.

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The Working for Water (WfW) Programme is a public works programme designed to clear South Africa of invasive alien vegetation and to restore lowwater consuming indigenous vegetation in the areas that have been cleared. Funds to clear alien invasives were initially secured on the basis that such a programme would increase water runoff, facilitate biodiversity and ecosystem functioning, and provide social benefits through job creation. The economic merits of the Programme, in terms of increased water yields, has been established in the Western Cape and KwaZulu-Natal, but questioned in the Easter

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3

Schonegevel, Lucille. "Modelling alien vegetation invasions and clearing strategies." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52341.

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Thesis (MSc)--Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: The burgeoning problem of alien plant invasions in South Africa necessitates effective decision-making based on an understanding of the complex processes that govern these invasions. Due to the spatial nature of the problem, this study explored the use of Geographic Information Systems and spatial models for predicting the spread of alien vegetation and assessing the effectiveness of clearing strategies. The Spatially Explicit Individual Based Simulation (SEIBS) model was identified as a potentially useful tool for alien pl

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4

Slabber, Sarette. "Physiological plasticity in arthropods from Marion Island : indigenous and alien species." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50417.

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Thesis (PhD)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Climate sets range limits in many taxa, and as climate changes, the ranges that plants and animals occupy are altered. The responses of species to climate change involve either migration or local adaptation. An investigation of the local physiological adaptation shown by indigenous and alien arthropods to temperature acclimation formed the primary focus of this study. Increased environmental temperatures favour the establishment of alien species on Southern Ocean Islands. The first records of Porce/lio scaber Latreille,

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5

Ndwayana, Hamilton Ncedo. "A sustainable development approach in the control of alien invasion vegetation." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020803.

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Invasive alien tree species have negative environmental and economic impacts throughout the world. For example, black wattle (Acacia mearnsii) threatens native habitats by competing with and so repressing or excluding indigenous vegetation: in this way it replaces grass communities, reduces biodiversity, and increases water loss from riparian zones, thereby fundamentally damaging the ecosystem. The Acacia mearnsii threat requires urgent attention: effective control and management is urgently required if these deleterious impacts are to be reversed or prevented. The present study was conducted

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6

Mukhadi, Fulufhelo Licken. "Phenology of indigenous and alien vascular flowering plants on sub-Antarctic Marion Island." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/6890.

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Thesis (MSc)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Species’ seasonal behaviour is of paramount importance in understanding community functioning and dynamics. Recently, plant phenology has further gained significance as a reliable indicator of climate change impacts. Despite the importance of understanding plant dynamics, there are relatively few plant phenological records for the sub-Antarctic region, and where records exist they are often not extensive. Sub-Antarctic Marion Island, typical of Southern Ocean Islands, offers a useful setting for addressing these knowledge g

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7

Simelane, Bhekithemba Doctor. "Indigenous knowledge and vegetation utilisation in Khayelitsha, Cape Town." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4577_1209045528.

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<p>The aim of this study was to investigate indigenous knowledge of vegetation resource utilisation, in particular the use of traditional medicinal plants in the provision of health care in the community of Khayelitsha and to determine traditional resource management approaches.</p>

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8

Pattison, Zarah. "Effects of invasive alien plants on riparian vegetation and their response to environmental factors." Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/25404.

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Biological invasions are reportedly one of the major contributory factors to biodiversity loss worldwide. The impacts of invasive alien plant (IAP) species on native communities are widely documented in the scientific literature, however, there is still a lack of detailed information on their impacts within the most vulnerable habitats. Riparian habitats are highly dynamic systems and naturally disturbed, making them particularly vulnerable to invasion. Climate change, directly or indirectly, is also predicted to adversely impact river systems, which may subsequently alter invasion rates and t

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9

De, la Fontaine Samantha. "Assessing the values and impacts of invasive alien plants on the livelihoods of rural land-users on the Agulhas Plain, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95461.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Invasive alien plants (IAPs) are known for their detrimental impacts on biodiversity and ecosystem goods and services. A substantial body of research has contributed to our understanding of their impacts on ecology. In comparison the socio-economic aspects of IAPs, are not well understood. Additionally, valuation practises have usually excluded the positive and the non-monetary impacts (benefits and uses) that IAPs hold for local livelihoods. Holistic valuation has been regarded as imperative for decision-making and managerial f

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10

Nowell, Megan Sarah. "Determining the hydrological benefits of clearing invasive alien vegetation on the Agulhas Plain, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6855.

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Thesis (MScConEcol (Conservation Ecology and Entomology))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Invasive alien plants (IAPs) reduce streamflow and threaten the biodiversity of South Africa’s Cape Floristic Region. Up-to-date information on invasive vegetation is required for land management agencies to formulate policies and make appropriate resource management decisions. Invasion maps are typically not updated often enough because of the time and expenses required to do so. As a result, invasion maps for South Africa are limited to coarse resolution data or isolated

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11

Fatoki, Oluwakemi Busayo. "Monitoring the re-growth rate of alien vegetation after fire on Agulhas Plain, South Africa." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/1639.

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12

Blanchard, Ryan. "An investigation of riparian vegetation recovery following invasive alien tree clearing in the Western Cape." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6235.

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Includes abstract.<br>Includes bibliographical references (leaves 113-134).<br>Riparian zones are dynamic, as a result of varying levels of disturbance from natural flooding regimes, and this makes them particularly susceptible habitats to invasion by alien plants. In South Africa, particularly the Fynbos Biome, closed-stand invasions by alien Acacia and Eucalyptus species have been able to develop within riparian areas. Their impacts on water resources and biodiversity have been countered by manual clearing in order to protect the valuable ecosystem services provided by intact riparian zones,

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13

Phiri, E. E. "Species occupancy, distribution and abundance : indigenous and alien invasive vascular plants on sub-Antarctic Marion Island." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/47001.

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Thesis (MSc)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Macroecological relationships have rarely been studied at wide spatial scales and across geographic ranges of species in the field in the sub-Antarctic. In this thesis I examined the occupancy, distribution and abundance, and the relationships thereof, of indigenous plants and alien species at broad (island-wide) and fine scales across sub-Antarctic Marion Island. The impacts of alien species and their interactions with indigenous plants were also investigated. I examined the nature of the abundance structure of a cushion-formi

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14

Lee, Jennifer Elizabeth. "Alien species and propagules in the Antarctic : movements through space and time." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/4508.

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Thesis (PhD (Botany and Zoology))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: Although the impacts of biological invasions are widely appreciated, a bias exists in research effort to post‐dispersal processes because of the difficulties of measuring propagule pressure and the detecting of newly established species. Here the Antarctic is used as a model system in which to quantify the initial dispersal of alien species and investigate the factors that contribute to the establishment and range dynamics of alien species once they have arrived in the region. Human movements are known t

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15

Kuroiwa, Kirk D. "The identification of indigenous vegetation capable of survival in lead-contaminated environments." Virtual Press, 2001. http://liblink.bsu.edu/uhtbin/catkey/1221308.

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Evaluation of heavy metal accumulation in soils and plants is of environmental importance due to their health effects on humans and other biota. Phytoremediation is an emerging technology that can stabilize or remove heavy metals in soil utilizing metal tolerant plant species (metallophytes). The objectives of this study were to: (1) assess a Superfund site, and a lead-acid battery dump for concentrations of soil lead (Pb) and cadmium (Cd); (2) assess the various chemical fractions of Pb and Cd at both sites; (3) identify native herbaceous vegetation surviving in the contaminated soils; and (4

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16

Ntshidi, Zanele. "A comparative assessment of the quantity and sources of water used by alien invasive prosopis spp and indigenous Acacia karroo in the Northern Cape Province." University of the Western Cape, 2015. http://hdl.handle.net/11394/4760.

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>Magister Scientiae - MSc<br>Invasive alien plants (IAPs) are often reported to use more water than indigenous plants. Inaddition, IAPs have an ability to adapt to harsh environmental conditions and they tend to spread at rapid rates, thereby threatening the country’s water resources, agricultural land, and biodiversity. Much of South Africa is expected to get drier in future due to climate change and the new climatic conditions are also predicted to accelerate the rate at which alien plants will spread. Approximately 10 million hectares are currently estimated to have been invaded by alien pl

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17

Rate, Stephen R., and n/a. "Invertebrate diversity and vegetation heterogeneity : plant-invertebrate relationships in indigenous New Zealand grasslands." University of Otago. Department of Botany, 2005. http://adt.otago.ac.nz./public/adt-NZDU20061025.144447.

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Spatial heterogeneity of the environment, as measured by floral diversity, composition and structure, is known to influence the distribution and diversity of invertebrates. Heterogeneity brought about by anthropogenic disturbance may be a threat to invertebrate diversity. This thesis investigates the impacts of vegetation heterogeneity at a range of scales on the diversity of invertebrate populations in modified high-altitude indigenous grasslands on the Rock and Pillar Range, Central Otago. Invertebrates were sampled in and on the edges of snow tussock fragments to assess whether species ri

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18

Goets, Stefan Albert. "Seed ecology and growth comparisons of native (Virgilia divaricata) and invasive alien (Acacia mearnsii and A. melanoxylon) plants: implications for conservation." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/15248.

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The abundance of invasive alien plants, with their numerous associated negative effects, has resulted in challenging and costly management requirements in South Africa. Management of invasives is further complicated when species have rapid inherent growth rates, atmospheric nitrogen fixing capabilities and large, persistent seed banks. Management strategies other than the usual mechanical, chemical, and biological (and combinations thereof) methods may be more effective. An alternative strategy is ’habitat management’, whereby management may be aimed at favouring native species. If the native

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19

Naicker, Isayvani. "The role of science in issue advocacy : invasive alien plant species in the fynbos vegetation of South Africa." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610726.

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20

Itholeng, Kebalepile Benedict Itholeng. "The indigenous knowledge of the local community towards weeds and alien invasive plants in the Dinokana area, North-West Province, South Africa / by Kebalepile Benedict Itholeng." Thesis, North-West University, 2007. http://hdl.handle.net/10394/2129.

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21

Magoba, Rembuluwani Norman Nicholas. "Effect of invasion and clearing of alien riparian vegetation on benthic macroinvertebrate and adult odonata assemblages in Soutpansberg rivers." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1800.

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Thesis (MScAgric (Conservation Ecology and Entomology)--University of Stellenbosch, 2005.<br>Benthic macroinvertebrates (sampled using South African Scoring System, SASS5) and adult male Odonata (sampled with close-focus binoculars) were recorded on two streams and a river of Soutpansberg, with the aim of determining the effect of invasion and removal of alien riparian vegetation on their assemblages. A secondary aim was to establish the importance of dragonflies as indicators of degree of disturbance in rivers. Forty two aquatic macroinvertebrate families and 33 adult Odonata species were rec

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22

Engledow, Henry Riley. "The effect of four invasive alien species on various soil factors and immediate post-fire vegetation - in mountain fynbos." Thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/26100.

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23

Yelenik, Stephanie. "Ecosystem level impacts of annual and perennial N2-fixing invasive alien plants in the fynbos vegetation of South Africa." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/11404.

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Bibliography: leaves 79-96.<br>In the nutrient-poor fynbos, changes in soil nutrients can affect species composition and community structure. The N2-fixing ability of invasive alien plants, therefore, may have impacts on ecosystem and community functioning within the fynbos vegetation type. This study investigated changes in fynbos N cycling regimes with the invasion of two different N2-fixing invasive alien plants, Acacia saligna and Lupinus luteus.

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24

Jeffery, Douglas. "The effect of dry heat on the seed germination of two indigenous and two alien legume species in South Africa." Thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/26714.

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25

Ayuk, James. "Water regime requirements and possible climate change effects on Fynbos Biome Restionaceae." University of the Western Cape, 2018. http://hdl.handle.net/11394/6766.

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Philosophiae Doctor - PhD<br>The Cape Floristic Region (CFR) of southern Africa is one of the world’s most unique biodiversity hotspots. However, this biodiversity continues to be threatened by habitat loss due to rapid urbanisation, agriculture and alien vegetation encroachment, and now, by future groundwater extraction and climate change. Previous work had shown that soil moisture is important in structuring wetland plant communities at fine-scale. What is not fully known, however, is how the spatial distribution of species at a local scale is related to soil hydrology and what the res

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26

Madden, Christine. "The impacts of indigenous herbivore grazing over five years (2004 - 2008) on vegetation dynamics in four distinct vegetation types of the winter-rainfall Little Karoo." Bachelor's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/26304.

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Vegetation in semi-arid regions is subject to change when heavily utilised by herbivores. Changes in species richness, species and growth form composition, total cover and plant palatability in response to rest (fenced) and grazing (open) treatments was investigated in Sanbona Wildlife Reserve over five years (2004-2008). This reserve is over 55 000 ha and has four dominant vegetation types: Little Karoo Quartz Vygieveld, Western Little Karoo, Montagu Shale Renosterveld and previously transformed Renosterveld classified here as Old Lands. There was no significant change in vegetation dynamics

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27

Gatehouse, Hazel A. W. "Ecology of the naturalisation and geographic distribution of the non-indigenous seed plant species of New Zealand." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/1009.

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The naturalisation and subsequent spread of non-indigenous plant species (NIPS) is a major problem for most regions of the world. Managing plant invasions requires greater understanding of factors that determine initial naturalisation and distribution of wild NIPS. By the year 2000, 2252 NIPS were recorded as wild (1773 fully naturalised and 479 casual) in New Zealand. From published literature and electronic herbaria records, I recorded year of discovery of wild populations, and regional distribution of these wild NIPS. I also recorded species related attributes hypothesised to affect natural

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Mokotjomela, Thabiso Michael. "A comparison of bird foraging preferences for fruits of indigenous and alien shrubs and seed dispersal potentials in the Cape Floristic Region." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20374.

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Thesis (PhD)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: This study tested the proposal that fleshy-fruited alien shrubs competed more effectively for avian dispersal services than indigenous shrubs. Several different quantitative measures of increasing complexity were applied to test bird foraging preferences for fruits of two established alien shrubs (Lantana camara, Solanum mauritianum), two emergent alien shrubs (Myoporum tenuifolium, Pittisporum undulatum) and two indigenous shrubs (Chrysanthemoides monilifera, Olea europaea subsp. africana). Overall the simplest quantitativ

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29

Magoro, Mandla Leon. "Predation by alien largemouth bass, Micropterus salmoides Lacepéde 1802 (Centrarchidae: Perciformes), on indigenous marine fish species in the Kowie System, South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011939.

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Estuaries serve as nursery areas for a large number of estuary-associated fish species. Some of these taxa also use river catchments as nursery areas. During the upstream migration of this latter group, the juveniles are prone to predation by native and alien predatory fish inhabiting the system. The rate of invasion of ecosystems by alien organisms can be directly linked to anthropogenic influences, including both intentional and unintentional introductions by alien organisms into new regions. The largemouth bass, Micropterus salmoides, is a facultative piscivorous fish that has been successf

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30

Carpenter, Robert Charles. "An economic analysis of eradicating alien vegetation as an alternative to conventional water supply schemes: a case study of the Krom and Kouga." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1002735.

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South Africa is classified as an arid to semi-arid region and water scarcity in South Africa has been identified as a key factor limiting socioeconomic development in the next century. In the Algoa region, the total urban plus agricultural water demand is expected to exceed the supply by the year 2005. The Kouga Working for Water Project aims to increase the base flow to the existing dams which supply the Port Elizabeth metropolitan area through the eradication of invasive alien trees in the riparian areas of the Krom and Kouga catchments. This thesis analyses the economic efficiency of optima

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31

Fraser, Michael 1957. "Effects of natural vegetation, fire and alien plant invasion on bird species assemblages in mountain fynbos of the southwestern Cape Province, South Africa." Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/8423.

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Bibliography: leaves 148-160.<br>The effects on birds of fine-scale differences in plant species assemblage and vegetation structure, and of two major disturbance factors (woody alien plant infestation and fire), were investigated in Mountain Fynbos at two sites in the southwestern Cape Province, South Africa. Three associated processes were also studied. These were the relative importance of three animal taxa as seed predators following fire, the extent to which an indigenous bird species ate alien Acacia cyclops fruits, and potentially dispersed its seeds, and the number of nectarivorous bir

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32

Campbell, Thornton. "Edaphic zoning and species-site matching to assist re-vegetation of indigenous species at the Styx Mill Reserve." Thesis, University of Canterbury. School of Forestry, 2014. http://hdl.handle.net/10092/10462.

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The Styx Mill Reserve is located in Belfast, Christchurch and is managed by the Christchurch City Council. Who aim to re-establish indigenous vegetation to large proportions of the area. These efforts have been successful in some sections of the Reserve; but large areas of the Reserve remain in grass and other weeds. The purpose of this investigation was to evaluate the presence of 5 hypothesised edaphic1 zones in a 10 ha study area, with a future aim of matching establishment practices to these edaphic sites. Findings indicated that all zones have significantly different vegetation and soil c

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Woodford, Darragh J. "The impact of alien invasive smallmouth bass (Micropterus dolomieu) on the indigenous fish of the Rondegat River : a quantitative assessment with implications for rehabilitation." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/6739.

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Alien invasive fishes are a growing concern in inland water ecosystems around the world, as they are capable of causing serious damage, especially to indigenous fish populations. Mechanisms include direct predation on indigenous fish by alien predatory species, competition for food and space between native and introduced species, the introduction of alien parasites and pathogens, and general environmental degradation. The Cape Floristic Region (CFR) of South Africa, which is defined by a unique and highly diverse floral kingdom, is also home to a unique and highly threatened ichthyofauna. This

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Törn, A. (Anne). "Sustainability of nature-based tourism." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514286674.

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Abstract Nature-based tourism has increased considerably during recent years, which has raised questions about the tolerance of ecosystems experiencing growing visitor numbers. The present thesis focuses on the ecological and social sustainability of nature-based tourism in protected areas and their surroundings. The objective of the ecological studies was to determine the effects of tourism on vegetation, soils and risk of introduction of alien plant species. The social survey investigated whether opinions concerning nature conservation and tourism by local people are dependent on socio-econo

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Vorster, Liesl. "Current status and impact (2004-2015) of indigenous ungulate herbivory on the vegetation of Sanbona Wildlife Reserve in the Little Karoo." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25523.

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Game farming is becoming more popular in southern Africa and the introduction of large indigenous ungulates into confined enclosed areas could alter plant communities and ecosystem processes. This is of particular concern in semi-arid rangelands of the Succulent Karoo where the evolutionary history of grazing is not clear and the compatibility of large herbivores in confined areas remains to be demonstrated. The establishment of Sanbona Wildlife Reserve, a 54 000 hectare private game reserve in the Little Karoo, which converted from livestock farming to game farming, allows an opportunity to s

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Parminter, Terry Graham. "An examination of the use of a human behaviour model for natural resource policy design and implementation by government (central and regional) agencies." The University of Waikato, 2009. http://hdl.handle.net/10289/2638.

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In recent years, one of the most significant pieces of environmental legislation in New Zealand has been the Resource Management Act (New Zealand Government 1991) that has empowered local government agencies to manage the use of natural resources in their regions. Three Government Departments have been responsible for developing policies directly relating to the use of natural resources in New Zealand. The Department of Conservation has been mainly concerned with the management of natural resources on public land. The Ministry for the Environment has particularly addressed environmental pol

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Rossi, Luciene Aparecida Leite. "Influência da composição química foliar na colonização por larvas de Chironomidae (Diptera) durante a decomposição em riachos." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/7827.

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Sharratt, Norma. "Response of aquatic macroinvertebrate and aerial odonate assemblages to the removal of invasive alien trees in the Western Cape." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50440.

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Thesis (MSc)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Invasive alien trees, especially Acacia species, are a great threat to biodiversity in South African rivers. The national Working for Water Programme is addressing the alien problem by removing alien trees from river margins. The concern is that this may be creating even further disturbance by affecting water quality and habitats. In particular, how is this affecting rare and endemic species? Benthic macro invertebrates and aerial odonates were assessed along five Western Cape rivers in alien-invaded, cleared and natura

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Memiaghe, Herve Roland. "Old field restoration : vegetation response to soil changes and restoration efforts in Western Cape Lowlands." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1956.

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Thesis (MScConsEcol (Conservation Ecology and Entomology))--Stellenbosch University, 2008.<br>In the Mediterranean climate regions of the world, agricultural practices have caused considerable landscape transformation and lead to introduction of alien species that now dominate secondary succession on abandoned agricultural fields. Various restoration attempts have been made to reduce alien plant species cover, and to enhance the re-establishment and cover of native plant species. However, results and successes were mostly short-term due to re-growth and persistence of the weedy alien spec

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Gravuer, Kelly. "Determinants of the introduction, naturalisation, and spread of Trifolium species in New Zealand." Master's thesis, Lincoln University. Bio-Protection and Ecology Division, 2004. http://theses.lincoln.ac.nz/public/adt-NZLIU20071015.060329/.

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Two conceptual approaches which offer promise for improved understanding of biological invasions are conceptualizing the invasion process as a series of distinct stages and explicitly incorporating human actions into analyses. This study explores the utility of these approaches for understanding the invasion of Trifolium (true clover) species in New Zealand. From the published literature, I collected a range of Trifolium species attributes, including aspects of global transport and use by humans, opportunistic association with humans in New Zealand, native range attributes, habitat character

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Ndhlovu, Thabisisani. "Impact of Prosopis (mesquite) invasion and clearing on ecosystem structure, function and agricultural productivity in semi-arid Nama Karoo rangeland, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6751.

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Thesis (MScConEcol (Conservation Ecology and Entomology))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: I evaluated the impact of Prosopis invasion and clearing on ecological structure, function and agricultural productivity in heavily grazed Nama Karoo rangeland on two sheep farms near the town of Beaufort West in the Western Cape Province of South Africa. My aims were to (1) determine the effects of invasion and clearing on rangeland vegetation composition, diversity (alien and indigenous species richness) and structure (alien and indigenous species cover), soil vegetatio

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Mayonde, Samalesu Guelor. "Genotypic and phylogeographic investigation of indigenous and alien Tamarix species in Southern Africa." Thesis, 2014.

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Tamarix (Tamaricaceae) is from the Old World, but has become naturalized and invaded other parts of the world including South Africa. Tamarix usneoides is the only species native to southern Africa, but the exotic species T. aphylla, T. chinensis, T. parviflora and T. ramosissima have been reported to be present in South Africa and these Tamarix species are hypothesized to be hybridizing among themselves and with the indigenous T. usneoides. Among the exotic species, T. chinensis, T. ramosissima and their putative hybrids have become invasive. Tamarix usneoides is used in southern African mine

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Mwaura, Joseph M. "Sustainable control of invasive alien vegetation : perceptions of stakeholders of the Empofana Riparian Rehabilitation Project." Thesis, 2000. http://hdl.handle.net/10413/4941.

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The eMpofana riparian rehabilitation project (eMRRP) is a pilot project started by Umgeni Water (UW) to demonstrate how effective the removal of invasive alien vegetation is in improving the water yield of a catchment. The disturbance of the country's vulnerable wetland and riparian zones is a major factor contributing to water· stress. The study area was eMpofana riparian areas of Kwazulu-Natal midlands. The study was conducted to establish perceptions of property owners and project employees on eMpofana riparian rehabilitation project with regard to control of invasive alien vegetation. Apar

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Robertson, M. P., Martin Herrer Villet, and A. R. Palmer. "A fuzzy classification technique for predicting species' distributions: applications using invasive alien plants and indigenous insects." 2004. http://hdl.handle.net/10962/d1011659.

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A new predictive modelling technique called the fuzzy envelope model (FEM) is introduced. The technique can be used to predict potential distributions of organisms using presence-only locality records and a set of environmental predictor variables. FEM uses fuzzy logic to classify a set of predictor variable maps based on the values associated with presence records and combines the results to produce a potential distribution map for a target species. This technique represents several refinements of the envelope approach used in the BIOCLIM modelling package. These refinements are related to th

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Cooper, Jenny. "Costs and benefits of eradicating alien invasive vegetation from the upper reaches of the Mhlatuze catchment." Thesis, 2001. http://hdl.handle.net/10413/2961.

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Alien invasive vegetation threatens the functioning of natural ecosystems as well as their services, which sustain human welfare, both directly and indirectly. The proliferation of this vegetation in South Africa has been attributed to the ignorance of the social implications affiliated to their existence. Investment decisions are predominantly based on the marginal private costs of an activity, since individuals have not been made accountable for costs imposed on society in the past. Consequently, their marginal private costs always fall well short of the marginal social costs. In order to pr

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Taylor, Kelly May. "Susceptibility of indigenous aquatic plants to alien invasives : competitive interactions as influenced by nutrient levels and density." Thesis, 2012. http://hdl.handle.net/10539/11238.

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MSc., Faculty of Science, University of the Witwatersrand, 2011<br>This research investigated the susceptibility of South African indigenous aquatic plants to competition from invasive species, using the competitive interactions of two sets of aquatic plants as a potential indicator. These interactions were studied in two separate experiments: the submersed weeds, Hydrilla verticillata (L.F.) Royle (Hydrocharitaceae) and an indigenous species, Lagarosiphon major (Ridley) Moss (Hydrocharitaceae) and; the floating weeds, Azolla filiculoides Lamarck (Azollaceae) and the indigenous Spirodela

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Beater, Margaret Mary Theresa. "Impacts of invasive alien plant clearing on Riparian vegetation recovery along Riverine corridors in Mpumalanga, South Africa." Thesis, 2007. http://hdl.handle.net/10539/2098.

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Student Number : 9907276D - MSc Dissertation - School of Animal, Plant and Environmental Sciences - Faculty of Science<br>The broad aim of this study was to measure the ecosystem repair of the Sabie River (which traverses through both the grassland and savanna biomes) riparian environment in Mpumalanga, South Africa, in response to the clearing of alien plants by the Working for Water (WfW) alien plant clearing programme. This was done in order to assess the effectiveness of the WfW clearing on the Sabie River riparian plant community composition and associated environmental factors. Althou

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Shafer, Deborah Joyce. "Physiological factors affecting the distribution of the non-indigenous seagrass Zostera japonica along the Pacific coast of North America." 2007. http://catalog.hathitrust.org/api/volumes/oclc/237787635.html.

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Shackleton, Charlie. "Do indigenous street trees promote more biodiversity than alien ones? Evidence using mistletoes and birds in South Africa." 2016. http://hdl.handle.net/10962/60942.

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Trees in urban landscapes provide a range of ecosystem services, including habitat, refugia, food, and corridors for other fauna and flora. However, there is some debate whether the richness and abundance of other biodiversity supported is influenced by the provenance of trees, i.e., native or non-native. This study assessed the presence of mistletoes and birds (and nests) in 1261 street trees. There were marked differences between native and non-native street trees, with the former having a significantly higher prevalence of birds (and nests) and supporting more species and in greater densiti

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Morris, Taryn Lee. "Vegetation responses to invasive alien plant clearing along the Sabie River in and adjacent to the Kruger National Park." Thesis, 2009. http://hdl.handle.net/10539/6788.

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Alien plant invasions are a global problem and have widespread ecological and economic impacts. River ecosystems are highly prone to invasion by alien plants due to their dynamic hydrology and the ability of water to efficiently transport alien plant propagules. This, together with continuous access to water and nutrient resources, facilitates invasions. The recognized impact of woody alien species in reducing scarce water resources in South Africa inspired the inception of the Working for Water (WfW) programme. This programme aims to increase future water yields through the large scale

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